Nicolas Poussin (1594-1665)  A thought-provoking exhibition which offers a different view of Poussin’s early work in Rome and displays his paintings in a sympathetic and joyous environment.  Guest review by Sarah Mulvey Detail from a Bacchanalian Revel Before a Term, ca.1632-33, London, National Gallery  I am spellbound before Poussin’s painting of the Adoration of the Golden Calf in the…